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The Neuro-Situation of Altruism

Situationist friend David Berreby has a post this week on a recent study suggesting a possible link between the brain and altruistic behavior. Here’s how it starts:

In pursuit of the biological basis of morality, researchers are interested in an area of the brain at the boundary of the right temporal lobe and the right parietal lobe (very roughly, it’s located maybe 2 inches above the midpoint of a line between your right eyebrow and your right ear, not that I recommend digging around for it). This right temporoparietal junction has been linked in various ways to moral judgments about the self and others. Now this paper, out today in the journal Neuron, supplies some striking new evidence for this area’s importance. In lab experiments, people with more brain cells in this region were more altruistic than people with fewer.

Yosuke Morishima and his co-authors ran a functional MRI scan of their volunteers at the University of Zurich as they allocated a sum of money between themselves and an anonymous second person. (By the way, “Yosuke,” for an altruism researcher, is an aptonym. It’s a name that means “to give help” or “great support.”) Some of the participants were quite selfish, while others were much more altruistic, giving up a meaningful amount of cash for another person whom they did not know. And it turned out the volunteer’s degree of altruism correlated with the amount of gray matter they possessed at the right temporoparietal junction (“gray matter” consists of neurons (the cells whose activity makes brains brains) as well as the glial cells that support them and their blood supply).